A local council's planning approval may be quashed for jurisdictional error where the council proceeded on the basis of materially erroneous information in planning officers' reports, failed to genuinely apply its corporate mind to the statutory criteria for relaxation of planning requirements, and based its decision on irrelevant considerations such as the existence of a prior (flawed) approval. Where breaches of substantive planning law are established, a respondent seeking to resist certiorari on grounds of delay and prejudice must demonstrate substantial hardship or prejudice to rights, not merely speculative loss of expected profit.
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